Boiler



Nov. 2 1926.

A. o. MILLER BOILER Filed July 5Q 1922 INVENTOR %//9/7 0. MY/'r ATTORNEY- Patented Nov. 2, 1926.

UNITED STATES PATENT 355$? ALLEN O. MILLER, OF SEATTLE, WASHINGTON, ASSIGNOR TO WESTERN BLOYVER 06.,

7 OF SEATTLE, WASHINGTON, A CORPORATION OF WASHINGTON.

BOILER.

Application filed July s,

This invention relates to horizontal steam and hot-water boilers.

The principal objectof my invention is the improvement of boilers of this type to render the same more eflicient in operation and economical in the consumption of fuel.

More specific objects and advantages of the invention will appear in the following specification.

The invention consists in the novel construction, adaptation, and combination of parts hereinafter described and claimed.

In the accompanying drawings,-

Figure 1 is a view partly in side elevation and partly in longitudinal section of a boiler embodying my improvements. Fig. 2 is a view partly in front elevation and partly in transverse section of the same, the sectionalized part of the furnace baflie being taken through 2-2 of Fig. 1. Fig. 3 is a detail sectional view through 3-3 of Fig. 1. Fig. 4 is a perspective View of one of the baiiie blocks shown detached.

As shown in the drawings, my improved boiler comprises a base member 5, an intermediate wall section 6 supported thereon, and a cylindrical shell 7 which seats in substantially semi-circular recesses 8 and 9 provided in both the front and rear walls 8 and 9 of said wall section and between the side walls 10 and 10 of the latter.

The walls of said wall section are hollow to provide therein water spaces which communicate with each other. The shell 7 is made to'provide therein and adjacent to its rear end, a cavity 11 extending upwardly from its underside to about its midheight to afford a combustion space between a water containing leg 12 at the rear and the back tube sheet 13 for the boiler tubes 14.

Said shell is separably connected from in front of and to the rear respectively of the space 11 with the interior of the wall 9 by means of pipes 15 and 16 which include couplings, such as 15 and 16 The pipe 15 is preferably connected to the lower portion or the wall 9 and is accessible for cleaning out through the medium of a hand hole 17 for which is provided a plate closure 18. The other pipe 16, above mentioned, is located outside of the boiler and is preferably connected with the interior of the wall 9 at an elevation above the connection therewith of the pipe 15.

At diametrically opposite sides of the 1922. Serial No. 572,381.

shell the same is connected with the chambers of the side walls 10 and 10 by means of interfitting elbow attachments 19 and 20, of which the attachments 19 are secured to the shell and extend into sockets provided in the attachments 20.

The joints between the complen'ientary attachments are rendered water tight, shown in Fig. 3, by means of a gasket 21 employed in the socket element below a spigot end of the other attachment 19 and acting in cooperation with a packing sur rounding the part and held in place by a gland 12.

Located directly below the back tube sheet 13 and extending upwardly, from the base member 5 and between the side walls 10 and 10 of the intermediate section 6 is a bafiie wall 23 of a refractory material and which constitutes the rear wall of the boiler furnace 2 1. This baffle wall, moreover, is located in front of the pipe coupling 15 to protect the same from the region 2 1 of most intense heat within the boiler.

Extending downwardly into said furnace from the shell 7 is an arch-wall 25 composed of a plurality of blocks having heat refractory characteristics. As illustrated, said arch consists of upper courses of blocks 26 which are supported upon a lower course of blocks 27 and 28 which, in turn, is supported upon an arch tube secured at its opposite ends in the inner plate elements 30 of the re spective side walls 10 and 10 More particularly, said' arch-tube is formed with bends 31 and 32 to provide substantially vertical and horizontal elements 33 and 3a to allow for the expansion and contraction of the tube due to changes of temperature and also afford connections at different elevations with the respective side walls to promote the passage of water through the tube from one of said walls to the other one.

The lower course of arch blocks have interengaging tongue and groove connections, indicated by 35 and 36 and are each provided in its underside with a groove 37 to receive the tube part 34 to avoid confusion, the groove 37 is omitted from Fig. 1.

The groove 37 of the end block 28 is continued as at 37 up one of its sides to receive therein the portion 33 of the arch tube which serves to prevent the wall tilting in a forwardly or rearwardly direction. The

blocks 27 and 28 are furthermore, provided in their meeting sides with complementary channels 38 to provide passages to direct the gases of combustion in a downwardly and rearwardly direction through the arch wall instead of below the latter over the fuel bed.

39 represents a door through which the fur- .to close the opening below the. arch-wall whereby the latter dividesthe furnace chamber 24 to provide a firing compartment in front of the arch wall and a combustion chamber 2& to the rearthereof. This coinbustion chamber communicates through the throat opening above the baiile 23'withtlie combustion space 11 inside of the boiler body. w

In operation, a partial combustion of the fuel. gases occurs within the firing space of the furnace and the unconsiuned gases and flames escape through the arch passage 38 into the combustion chamber 24 and-against the hot baflie s3. -The combustion is completed in the chamber 24 and the cavity 11, whence the hot smoke and gaseous products of combustion travel through the boiler tubes to the chimney connection.

What I claim, is,-

1. A boiler comprising a shell having cylindrical end portions and a cavity inits underside between said cylindricaliend portions, a furnace member provided with water-containing side and end walls,- said end walls being provided with arcuate concavities in which the respective circular portions of said shell are seated in front of and to the rear respectively ofsaid shell cavity,

communicative connections between the intellOl' of said shell and the upper portions or the water spaces within the side walls of the furnace member and communicative connectrons between the rear and medial cyhndrn cal portions of the shell and the upper and lower;portions, respectively, of the water space within the rear wall of said furnace member.

2. A boiler comprising a shell having cylindrical end portions of the same diameter and a cavity in the underside of the shell between its cylindrical portions, a furnace member having water containing side walls connnunicatively connected with said shell member, a refractory baiile located directly below the rear wall of the cylindrical front portion of the shell extendingupwardly into the furnace chan'iber of the second named member, and an arch wall extending downwardly from said siell into said chamber at a distance in front of'said baille, said arch 'wall'being provided with passages arranged to cause fuel gases travellingtherthrough tobe'dir cted rearwardly and downwardly against said baffle.

,3. Aiboiler having a-furnace located between water containing side walls, a pipe sctical position by means of the substantially vertical portion of the pipe.

Signed at Seattle, ll ashington, this 23 day Zita ra 19,22.

ALLEN O. MILLER. 

